The Day of Reckoning has finally come for Mikoto! When his often-mentioned-but-never-seen girlfriend shows up for the school festival, Mikoto flies into a panic. It’s not the love of his life that has him sweating bullets, but someone far more terrifying – his sister! Can Mikoto trust his princess-pals Tohru and Shihoudani to keep the secret of their extracurricular activities from his suspicious sibling?